Unit #3 Quiz #2

Grade:«grade»

Subject:Aquatic Science

Date:«date»

1 Microbes account for about ________% of all the biological mass on Earth.

A 98%

B 75%

C 50%

D 22%

2 Which of the following reactions is responsible for fixing nitrogen:

A NH4

+ --> NO2

-

B NO2

- --> NO3

-

C NO3

- --> N2

D N2 --> NH3

3 At a neutral pH, which molecule is in the highest concentration

A carbonate

B bicarbonate

C carbonic acid

D carbon dioxide

4 A reaction between an acid and a base will always form water and ________.

A acid

B base

C salt

D carbonate

5 HCO3

- is

A carbonate

B bicarbonate

C carbonic acid

D carbon dioxide

6 Which of the following is NOT a protist:

A Hydra B Amoeba

C Euglena D Paramecium

7 H2CO3 is

A carbonate

B bicarbonate

C carbonic acid

D carbon dioxide

8 Which of the following is an example of molecular dissociation:

A H+ + OH- --> H2O

B H2O --> H+ OH-

C Fe + CuSO4 --> Cu + FeSO4

D AgNO3 + HCl --> HNO3 + AgCl

9 Which of the following makes up the smallest percent of global freshwater:

A glaciers

B permafrost

C groundwater

D surface & atmospheric water

10 The measure of water's ability to buffer against addition of an acid, i.e., ability to resist change of pH upon addition of an acid defines

A salinity

B alkalinity

C hydrophilic

D carbonate

11 What percentage of all of the planet's water is fresh water?

A 98%

B 70%

C 30%

D 2.5%

12 Which of the following is considered an indicator species:

A daphnia

B hydra

C diatoms

D amoebas

13 Which of the following describes a microbe's prime niche

A An environment that has a high amount of competition for resources

B An environment that has enough nutrients for the microbe to survive

C An environment that has enough nutrients for the microbe to thrive

D An environment that lacks any usable nutrients and is inhospitable to microbes

14 The following image demonstrates:

A high species richness but low abundance

B high species abundance but low richness

C high species richness and high species abundance

D low species richness and low species abundance

15 Which of the following describes the behavior of a hydrophobic substance:

A A solution that easily mixes into salt water

B A salt sample is added to fresh water & it quickly dissolves

C A solution is added to a water sample and the solution floats on top of the water

D A large sample of sugar is added to fresh water, but does not dissolve until heat is applied to the mixture

16 Hydrophilic means

A "water changing"

B "water hating"

C "water fearing"

D "water loving"

17 CO3

2- is

A carbonate

B bicarbonate

C carbonic acid

D carbon dioxide

18 Which element is always associated with organic compounds:

A salt

B carbon

C oxygen

D hydroxide

19 Which element is always associated with organic compounds:

A salt

B carbon

C oxygen

D hydroxide

20 Which of the following is primarily responsible for "fixing" carbon dioxide:

A autotrophs

B chemoautotrophs

C heterotrophs

D biopolymers